Rotary compressor, refrigerating cycle using the compressor, and refrigerator using the compressor

Abstract

A rotary compressor having a piston provided integrally with a blade is contained in a hermetic vessel which is operated at a suction pressure of the rotary compressor and not to discharge pressure. The rotary compressor includes a compression mechanism portion having a cylinder which includes a suction port formed in a cylinder chamber, a piston which eccentrically revolves in the cylinder, a blade which is integrally formed with the piston and partitions the cylinder chamber into a high pressure chamber and a low pressure chamber, and a driving shaft for revolving the piston. The rotary compressor also includes an electric motor portion for rotating the driving shaft, a hermetic vessel which houses the compression mechanism portion and the electric motor portion and is in communication with the suction port thereby to maintain an interior of the hermetic vessel at a suction pressure atmosphere, and a discharge port formed in the cylinder chamber and in direct communication with an exterior of the hermetic vessel, whereby starting is smoothly performed, a motor having a large starting torque is not required, components such check valves can be avoided, and lubricating oils with stable viscosity can be used such that the compressor operates with environmentally-friendly refrigerants.

We claim:  
     
       1. A blade-integrated piston type rotary compressor comprising: 
       a compression mechanism portion having a cylinder, including,  
       a suction port formed in a cylinder chamber,  
       a piston which eccentrically revolves in the cylinder,  
       a blade which is integrally formed with the piston and partitions the cylinder chamber into a high pressure chamber and a low pressure chamber, and  
       a driving shaft for revolving the piston;  
       an electric motor portion for rotating the driving shaft;  
       a hermetic vessel configured to house the compression mechanism portion and the electric motor portion and in communication with the suction port thereby to maintain an interior of the hermetic vessel at a suction pressure atmosphere; and  
       a discharge port formed in the cylinder chamber and in direct communication with an exterior of said hermetic vessel.  
     
     
       2. A rotary compressor according to claim  1 , wherein the compression mechanism portion and the electric motor portion are held in the hermetic vessel by an elastic supporting member, a clearance is provided between the compression mechanism portion and the inner wall of the hermetic vessel and a clearance is provided between the electric motor portion and the inner wall of the hermetic vessel. 
     
     
       3. A rotary compressor according to claim  1  or  2 , further comprising: 
       a refrigerant.  
     
     
       4. A rotary compressor according to claim  3 , wherein the refrigerant comprises an HFC refrigerant. 
     
     
       5. A rotary compressor according to claim  4 , further comprising: 
       a lubricating oil which is no more than slightly miscible with the HFC refrigerant.  
     
     
       6. A rotary compressor according to claim  3 , wherein the refrigerant comprises a hydrocarbon refrigerant. 
     
     
       7. A rotary compressor according to claim  6 , further comprising: 
       a lubricating oil which is no more than slightly miscible with the hydrocarbon refrigerant.  
     
     
       8. A refrigerating cycle comprising a compressor, an evaporator, a decompressor, and a condenser, characterized in that the rotary compressor according to claim  1  is used as the compressor. 
     
     
       9. A refrigerating cycle comprising a compressor, an evaporator, a decompressor, and a condenser, characterized in that the rotary compressor according to claim  3  is used as the compressor. 
     
     
       10. A refrigerating cycle comprising a compressor, and an evaporator, a decompressor, and a condenser, characterized in that the rotary compressor according to claim  8  is used as the compressor. 
     
     
       11. A refrigerator comprising a compressor, an evaporator, a decompressor, and a condenser, characterized in that the rotary compressor according to claim  1  is used as the compressor. 
     
     
       12. A refrigerator comprising a compressor, an evaporator, a decompressor, and a condenser, characterized in that the rotary compressor according to claim  3  is used as the compressor. 
     
     
       13. A refrigerator comprising a compressor, an evaporator, a decompressor, and a condenser, characterized in that the rotary compressor according to claim  8  is used as the compressor.